In Yeshwantpur, North Bangalore, the RSPM levels were as high as micrograms per cubic meter, an increase of 76% compared to last. Of the 15 air monitoring stations in Bengaluru, the data recorded in has showed that the RSPM levels have exceeded the national. Pollution Control Board data shows that RSPM levels decresed in six on ambient air quality in Bengaluru, air quality monitoring was.
This Diwali saw a 32% dip in air pollution - Times of India
Air pollution: Bengaluru’s RSPM levels exceed the allowed limit by % - The Hindu
The north-south divide manifests itself in data going back to the s as well. What explains this north-south divide in air pollution?
Both man-made and natural factors are responsible for this, says Anubha Goel, an assistant professor at the department of civil engineering at IIT-Kanpur. The stark temperature difference between winters and summers not only changes wind patterns, it also raises energy consumption, both fossil fuel and biomass, in North India.
Biomass burning, a significant contributor of PM2. Topographical and meteorological conditions, mainly wind flow characteristics, control both pollutant dispersion and residence time of airborne pollutants.
With Himalayas on the north acting as a barrier and limited availability of large water bodies acting as sinks, the dispersion of pollutants is limited in the Northern part of the country, particularly the Indo Gangetic Plain.
In contrast, coastal regions in the south have fresh winds coming in and polluted air blown out to the sea which controls pollutant levels significantly. How do Indian cities compare worldwide? The country that features the next highest number of cities is China, with 5 cities in the list. Goel puts down the difference to the differing sources of pollution for both pollutants. In these locations natural sources, such as dust and desert sand, mostly dominate observed PM10 levels.
On the other hand, PM2. The largest contributors to PM2.
Finally, any analysis of city-wide pollution levels based on current and historical data must be taken with a pinch of salt. This is because; quality of air pollution data is dependent on how extensively it is being collected. For example, if a city has just one air quality monitoring station, then its pollution levels can vary drastically depending on whether the station is located in a highly polluted area or not.
India lags behind major countries, in terms of number of monitoring stations adjusted for its population. Moreover, only a limited number of Indian cities are monitored by the CPCB, though coverage has steadily increased through the years.
Air pollution: Bengaluru’s RSPM levels exceed the allowed limit by 12-283%
There is no denying the fact that air quality monitoring efforts have improved in the recent past. If you thought CNG had made the Capital's air cleaner, then it's time for a reality check.
The alarming pollution levels have blackened Delhi 's air to such an extent that it ranks alongside coal town Jharia and unregulated industrial hubs like Ludhiana, Raipur and Kanpur. And it's the ever-increasing numbers of diesel-guzzling passenger cars and trucks plying unregulated on the city's roads that are largely to blame for the situation. Before you dismiss it as an alarmist report of the green lobby, here are some hard facts: If you don't realise, just how alarming the increase is, here are some more figures: Needless to say, these pollutants are linked to diseases ranging from bronchitis and asthma to lung infection and birth defects.
And the Capital is among the worst performers. The presentations showed that the level of NOx, which is attributed to the rise of diesel cars and unregulated trucks entering the Capital, is steadily rising. Diesel cars are close to 60 per cent of the new car sales in Delhi. Some cities, like Delhi, show a good correlation between the rising NOx levels and the increase in the number of vehicles. Trucks, according to the findings, contribute about 65 per cent of the total particulate matter PM concentration in Delhi's air.